我试图将远程句柄持久化为有状态EJB3.0 bean。该bean的接口已定义：

@Remote
public interface Hello extends Serializable {
     Handle getHandle();
     void sayHello();
}

实现是：

@Stateful
@TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
public class HelloBean implements Hello {

    @Resource
    private SessionContext ctx;

    @Override
    public Handle getHandle() {
          try {
              return ctx.getEJBObject().getHandle();
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
    }

    @Override
    public Handle sayHello() {
        System.out.println("hello");
    }
}

根据EJB Spec，那应该抓住我一个可序列化的句柄。但是我得到了：

Caused by: java.lang.IllegalStateException: EJBObject not available
    at com.sun.ejb.containers.EJBContextImpl.getEJBObject(EJBContextImpl.java:328)
    at com.zzz.zzz.HelloBean.getHandle(WorkHolderBean.java:125)
    ... 75 more

我不确定我理解我做错了什么…所有有状态的bean应该具有可序列化的句柄。在EJB3.0中是否有“正确”的方法来获取可序列化的句柄？